Examine source code of Sunrise-2

{
  "theme": {
    "images": {
      "theme_frame": "Sunrise-header-2.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Sunrise-2",
  "manifest_version": 2,
  "description": "Original: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/18b3131e0d60cb3d8ffd35fa1587216683af9120d1718b88794dad3aca9d7eaf/http%3A//commons.wikimedia.org/wiki/File%3ASunrise_thailand_ko_samui.jpg\">http://commons.wikimedia.org/wiki/File:Sunrise_thailand_ko_samui.jpg</a>\n\n\n (CC 3.0 BY-SA)"
}